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What is the result of the reaction between concentrated sulphuric(VI) acid and charcoal?
What is the result of the reaction between concentrated sulphuric(VI) acid and charcoal?
- Production of carbon(IV)oxide (correct)
- Production of sulphur(IV)oxide
- Production of nitric(V) acid
- Production of hydrochloric acid
What is the effect of diluting concentrated sulphuric(VI) acid?
What is the effect of diluting concentrated sulphuric(VI) acid?
- Increase in the number of moles present in a given volume of solution
- Production of nitric(V) acid
- Decrease in the number of moles present in a given volume of solution (correct)
- Production of sulphur(IV)oxide
What is the purpose of adding acidified potassium dichromate(VI) solution to the filter paper?
What is the purpose of adding acidified potassium dichromate(VI) solution to the filter paper?
- To test for the presence of hydrochloric acid
- To test for the presence of nitric(V) acid
- To test for the presence of charcoal
- To test for the presence of sulphur(IV)oxide (correct)
What is the type of reaction involved in the displacement of nitric(V) acid from its salt?
What is the type of reaction involved in the displacement of nitric(V) acid from its salt?
What is the role of concentrated sulphuric(VI) acid in the preparation of nitric(V) acid?
What is the role of concentrated sulphuric(VI) acid in the preparation of nitric(V) acid?
What is the effect of adding water to concentrated sulphuric(VI) acid?
What is the effect of adding water to concentrated sulphuric(VI) acid?
What is the purpose of using acidified potassium dichromate(VI) solution?
What is the purpose of using acidified potassium dichromate(VI) solution?
What is the result of the reaction between concentrated sulphuric(VI) acid and sulphur?
What is the result of the reaction between concentrated sulphuric(VI) acid and sulphur?
What happens when hydrogen sulphide gas is passed through acidified potassium dichromate(VI) solution?
What happens when hydrogen sulphide gas is passed through acidified potassium dichromate(VI) solution?
What is the byproduct of the reaction between hydrogen sulphide gas and acidified potassium dichromate(VI) solution?
What is the byproduct of the reaction between hydrogen sulphide gas and acidified potassium dichromate(VI) solution?
What is the purpose of using acidified potassium dichromate(VI) solution in a chemical test?
What is the purpose of using acidified potassium dichromate(VI) solution in a chemical test?
What happens when hydrogen sulphide gas is passed through acidified potassium manganate(VII) solution?
What happens when hydrogen sulphide gas is passed through acidified potassium manganate(VII) solution?
What is the byproduct of the reaction between hydrogen sulphide gas and acidified potassium manganate(VII) solution?
What is the byproduct of the reaction between hydrogen sulphide gas and acidified potassium manganate(VII) solution?
What is the purpose of using acidified potassium manganate(VII) solution in a chemical test?
What is the purpose of using acidified potassium manganate(VII) solution in a chemical test?
What happens when hydrogen sulphide gas is passed through bromine water?
What happens when hydrogen sulphide gas is passed through bromine water?
What is the byproduct of the reaction between hydrogen sulphide gas and bromine water?
What is the byproduct of the reaction between hydrogen sulphide gas and bromine water?
What is the result of the reaction between ZnCO3 and H2SO4?
What is the result of the reaction between ZnCO3 and H2SO4?
Which of the following oxides forms a blue solution when reacted with dilute sulphuric acid?
Which of the following oxides forms a blue solution when reacted with dilute sulphuric acid?
What is the product of the reaction between ZnO and H2SO4?
What is the product of the reaction between ZnO and H2SO4?
What is the result of the reaction between Na2O and H2SO4?
What is the result of the reaction between Na2O and H2SO4?
What is the common product of the reaction between a metal oxide and dilute sulphuric acid?
What is the common product of the reaction between a metal oxide and dilute sulphuric acid?
Why do the reactions of calcium, lead and barium carbonates with dilute sulphuric acid stop after a while?
Why do the reactions of calcium, lead and barium carbonates with dilute sulphuric acid stop after a while?
What is the product of the reaction between 2NaOH and H2SO4?
What is the product of the reaction between 2NaOH and H2SO4?
Where does hydrogen sulphide occur naturally?
Where does hydrogen sulphide occur naturally?
What is the product of the reaction between Mg(s) and H2SO4(aq)?
What is the product of the reaction between Mg(s) and H2SO4(aq)?
Which metal reacts explosively with dilute sulphuric acid?
Which metal reacts explosively with dilute sulphuric acid?
What happens when a metal carbonate or hydrogen carbonate is added to dilute sulphuric acid?
What happens when a metal carbonate or hydrogen carbonate is added to dilute sulphuric acid?
What is the colour of the solution formed when Iron(II)Carbonate is added to dilute sulphuric acid?
What is the colour of the solution formed when Iron(II)Carbonate is added to dilute sulphuric acid?
What is the product of the reaction between Zn(s) and H2SO4(aq)?
What is the product of the reaction between Zn(s) and H2SO4(aq)?
What is the purpose of introducing a burning splint on top of the boiling tube?
What is the purpose of introducing a burning splint on top of the boiling tube?
What is the characteristic of the gas produced when a metal carbonate or hydrogen carbonate is added to dilute sulphuric acid?
What is the characteristic of the gas produced when a metal carbonate or hydrogen carbonate is added to dilute sulphuric acid?
What is formed when carbon dioxide gas is bubbled in lime water?
What is formed when carbon dioxide gas is bubbled in lime water?
What is the product formed when Pb+(aq) reacts with H2S?
What is the product formed when Pb+(aq) reacts with H2S?
What is the colour of the precipitate formed when Cu2+(aq) reacts with H2S?
What is the colour of the precipitate formed when Cu2+(aq) reacts with H2S?
What is formed when H2S(g) reacts with NaOH(l) in equimolar concentrations?
What is formed when H2S(g) reacts with NaOH(l) in equimolar concentrations?
What is the purpose of adding nitric(V) acid in the test for sulphates and sulphites?
What is the purpose of adding nitric(V) acid in the test for sulphates and sulphites?
What is the observation when the preserved sample is heated to boil?
What is the observation when the preserved sample is heated to boil?
What is the purpose of adding acidified potassium manganate(VII) to the preserved sample?
What is the purpose of adding acidified potassium manganate(VII) to the preserved sample?
What is the observation when acidified potassium manganate(VII) is added to the preserved sample?
What is the observation when acidified potassium manganate(VII) is added to the preserved sample?
What is the final inference if the white precipitate persists on boiling?
What is the final inference if the white precipitate persists on boiling?
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Study Notes
Reaction between Sulphuric Acid and Metals
- Sulphuric acid oxidizes non-metals to non-metallic oxides and reduces itself to sulphur(IV)oxide gas
- Charcoal is oxidized to carbon(IV)oxide, and sulphur is oxidized to sulphur(IV)oxide
- Chemical equation: C(s) + 2H2SO4(aq) --> CO2(aq) + 2SO2(g) + 2H2O(l)
- S(s) + 2H2SO4(aq) --> 3SO2(g) + 2H2O(l)
Displacement of Less Volatile Acids
- Concentrated sulphuric acid displaces more volatile acids from their salts
- Chemical equation: KNO3(s) + H2SO4(aq) --> KHSO4(l) + HNO3(g)
- Chemical equation: KCl(s) + H2SO4(aq) --> KHSO4(s) + HCl(g)
Properties of Dilute Sulphuric Acid
- Dilute sulphuric acid is made by adding concentrated sulphuric acid to distilled water
- Diluting concentrated sulphuric acid decreases the number of moles present in a given volume of solution, making the acid less corrosive
- Chemical equations:
- Mg(s) + H2SO4(aq) --> MgSO4(aq) + H2(g)
- Zn(s) + H2SO4(aq) --> ZnSO4(aq) + H2(g)
- Fe(s) + H2SO4(aq) --> FeSO4(aq) + H2(g)
Reaction with Metal Carbonates and Hydrogen Carbonates
- Effervescence occurs when a metal carbonate or hydrogen carbonate is added to dilute sulphuric acid
- Carbon(IV)oxide gas is produced, which extinguishes a burning splint and forms a white precipitate when bubbled in lime water
- Chemical equations:
- ZnCO3(s) + H2SO4(aq) --> ZnSO4(aq) + H2O(l) + CO2(g)
- CuCO3(s) + H2SO4(aq) --> CuSO4(aq) + H2O(l) + CO2(g)
- FeCO3(s) + H2SO4(aq) --> FeSO4(aq) + H2O(l) + CO2(g)
- 2NaHCO3(s) + H2SO4(aq) --> Na2SO4(aq) + 2H2O(l) + 2CO2(g)
Reaction with Metal Oxides and Hydroxides
- Metal oxides react with dilute sulphuric acid to form a salt and water
- Chemical equations:
- ZnO(s) + H2SO4(aq) --> ZnSO4(aq) + H2O(l)
- CuO(s) + H2SO4(aq) --> CuSO4(aq) + H2O(l)
- MgO(s) + H2SO4(aq) --> MgSO4(aq) + H2O(l)
- Na2O(s) + H2SO4(aq) --> Na2SO4(aq) + H2O(l)
Reaction with Hydrogen Sulphide
- Hydrogen sulphide gas reduces acidified potassium dichromate(VI) from orange Cr2O72- ions to green Cr3+ ions
- Hydrogen sulphide gas decolorizes acidified purple potassium manganate(VII) solution
- Hydrogen sulphide gas reduces red-brown bromine water to colourless hydrobromic acid (HBr)
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